Foldable keyboard



FIG. 1 is a perspective view of a foldable keyboard in a closed or folded position showing our new design;

FIG. 2 is a perspective view of the foldable keyboard in an open or unfolded position;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines are shown in the views for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a foldable keyboard, as shown and described. 